If I recall from the original leak the "equipment" will be offered at a substantial discount... so the initial price should draw more interest than the minor mining/electrical cost & benefits.
I see more reason to be optimistic vs. disappointed.
21 inc is there to make money. That's why investors invested so much money in this company.
So think about it. Who are they making money off of? Their consumers, of course. There's no way they'll offer a bigger discount than the amount they'll earn back. Which means consumers lose.
Unless they're providing some other form of value, like TVs or routers do, as per RoadStress' examples. Every electric device we have currently gives us some value, which is why we're willing to sacrifice financially to use them. What value does 21 inc provide to the consumer? It's not financial. So what is it? I can't see it.
It's similar to a loan without interest... cheap upfront cost... they make up the difference in mining profits...
As an example your electrical cost may be offset by a higher grade appliance with energy star rating.
It's good for folks that can't afford the upfront cost or don't want to rack up finance charges.
Perfect for renters that have utilities included.
I'm sure 21 could also attract purchase volume discounts (buyers club).
Bottom line is we don't have all of the details... 21 & their investors would be foolish to roll this out without tangible benefits to the end users.